324 lines
10 KiB
Python
324 lines
10 KiB
Python
#!/usr/bin/env python3
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# Copyright (C) 2004 Tresys Technology, LLC
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# see file 'COPYING' for use and warranty information
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#
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# genhomedircon - this script is used to generate file context
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# configuration entries for user home directories based on their
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# default roles and is run when building the policy. Specifically, we
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# replace HOME_ROOT, HOME_DIR, and ROLE macros in .fc files with
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# generic and user-specific values.
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#
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# Based off original script by Dan Walsh, <dwalsh@redhat.com>
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#
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# ASSUMPTIONS:
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#
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# The file CONTEXTDIR/files/homedir_template exists. This file is used to
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# set up the home directory context for each real user.
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#
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# If a user has more than one role in CONTEXTDIR/local.users, genhomedircon uses
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# the first role in the list.
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#
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# If a user is not listed in CONTEXTDIR/local.users, he will default to user_u, role user
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#
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# "Real" users (as opposed to system users) are those whose UID is greater than
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# or equal STARTING_UID (usually 500) and whose login is not a member of
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# EXCLUDE_LOGINS. Users who are explicitly defined in CONTEXTDIR/local.users
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# are always "real" (including root, in the default configuration).
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#
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#
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# Old ASSUMPTIONS:
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#
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# If a user has more than one role in FILECONTEXTDIR/users, genhomedircon uses
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# the first role in the list.
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#
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# If a user is not listed in FILECONTEXTDIR/users, genhomedircon assumes that
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# the user's home dir will be found in one of the HOME_ROOTs.
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#
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# "Real" users (as opposed to system users) are those whose UID is greater than
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# or equal STARTING_UID (usually 500) and whose login is not a member of
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# EXCLUDE_LOGINS. Users who are explicitly defined in FILECONTEXTDIR/users
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# are always "real" (including root, in the default configuration).
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#
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import sys, pwd, getopt, re, os
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from subprocess import getstatusoutput
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EXCLUDE_LOGINS=["/sbin/nologin", "/bin/false"]
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def getStartingUID():
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starting_uid = 99999
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rc=getstatusoutput("grep -h '^UID_MIN' /etc/login.defs")
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if rc[0] == 0:
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uid_min = re.sub("^UID_MIN[^0-9]*", "", rc[1])
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#stip any comment from the end of the line
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uid_min = uid_min.split("#")[0]
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uid_min = uid_min.strip()
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if int(uid_min) < starting_uid:
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starting_uid = int(uid_min)
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rc=getstatusoutput("grep -h '^LU_UIDNUMBER' /etc/libuser.conf")
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if rc[0] == 0:
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lu_uidnumber = re.sub("^LU_UIDNUMBER[^0-9]*", "", rc[1])
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#stip any comment from the end of the line
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lu_uidnumber = re.sub("[ \t].*", "", lu_uidnumber)
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lu_uidnumber = lu_uidnumber.split("#")[0]
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lu_uidnumber = lu_uidnumber.strip()
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if int(lu_uidnumber) < starting_uid:
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starting_uid = int(lu_uidnumber)
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if starting_uid == 99999:
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starting_uid = 500
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return starting_uid
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def getDefaultHomeDir():
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ret = []
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if os.path.isfile('/etc/default/useradd'):
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rc=getstatusoutput("grep -h '^HOME' /etc/default/useradd")
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if rc[0] == 0:
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homedir = rc[1].split("=")[1]
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homedir = homedir.split("#")[0]
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homedir = homedir.strip()
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if not homedir in ret:
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ret.append(homedir)
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else:
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#rc[0] == 1 means the file was there, we read it, but the grep didn't match
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if rc[0] != 1:
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sys.stderr.write("(%d): %s\n" % (rc[0], rc[1]))
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sys.stderr.write("You do not have access to /etc/default/useradd HOME=\n")
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sys.stderr.flush()
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if os.path.isfile('/etc/libuser.conf'):
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rc=getstatusoutput("grep -h '^LU_HOMEDIRECTORY' /etc/libuser.conf")
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if rc[0] == 0:
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homedir = rc[1].split("=")[1]
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homedir = homedir.split("#")[0]
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homedir = homedir.strip()
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if not homedir in ret:
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ret.append(homedir)
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else:
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#rc[0] == 1 means the file was there, we read it, but the grep didn't match
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if rc[0] != 1:
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sys.stderr.write("(%d): %s\n" % (rc[0], rc[1]))
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sys.stderr.write("You do not have access to /etc/libuser.conf LU_HOMEDIRECTORY=\n")
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sys.stderr.flush()
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if ret == []:
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ret.append("/home")
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return ret
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def getSELinuxType(directory):
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rc=getstatusoutput("grep ^SELINUXTYPE= %s/config" % directory)
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if rc[0]==0:
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return rc[1].split("=")[-1].strip()
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return "targeted"
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def usage(error = ""):
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if error != "":
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sys.stderr.write("%s\n" % error)
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sys.stderr.write("Usage: %s [ -d selinuxdir ] [-n | --nopasswd] [-t selinuxtype ]\n" % sys.argv[0])
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sys.stderr.flush()
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sys.exit(1)
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def warning(warning = ""):
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sys.stderr.write("%s\n" % warning)
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sys.stderr.flush()
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def errorExit(error):
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sys.stderr.write("%s exiting for: " % sys.argv[0])
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sys.stderr.write("%s\n" % error)
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sys.stderr.flush()
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sys.exit(1)
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class selinuxConfig:
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def __init__(self, selinuxdir="/etc/selinux", setype="targeted", usepwd=1):
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self.setype=setype
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self.selinuxdir=selinuxdir +"/"
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self.contextdir="/contexts"
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self.filecontextdir=self.contextdir+"/files"
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self.usepwd=usepwd
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def getFileContextDir(self):
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return self.selinuxdir+self.setype+self.filecontextdir
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def getFileContextFile(self):
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return self.getFileContextDir()+"/file_contexts"
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def getHomeDirTemplate(self):
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return self.getFileContextDir()+"/homedir_template"
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def getHomeRootContext(self, homedir):
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rc=getstatusoutput("grep HOME_ROOT %s | sed -e \"s|^HOME_ROOT|%s|\"" % ( self.getHomeDirTemplate(), homedir))
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if rc[0] != 0:
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errorExit("sed error (" + str(rc[0]) + "): " + rc[1])
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return rc[1]+"\n"
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def getUsersFile(self):
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return self.selinuxdir+self.setype+"/users/local.users"
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def getSystemUsersFile(self):
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return self.selinuxdir+self.setype+"/users/system.users"
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def heading(self):
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ret = "\n#\n#\n# User-specific file contexts, generated via %s\n" % sys.argv[0]
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ret += "# edit %s to change file_context\n#\n#\n" % self.getUsersFile()
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return ret
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def getUsers(self):
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users=""
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rc = getstatusoutput('grep "^user" %s' % self.getSystemUsersFile())
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if rc[0] == 0:
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users+=rc[1]+"\n"
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rc = getstatusoutput("grep ^user %s" % self.getUsersFile())
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if rc[0] == 0:
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users+=rc[1]
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udict = {}
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if users != "":
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ulist = users.split("\n")
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for u in ulist:
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user = u.split()
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try:
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if len(user)==0 or user[1] == "user_u" or user[1] == "system_u":
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continue
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# !!! chooses first role in the list to use in the file context !!!
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role = user[3]
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if role == "{":
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role = user[4]
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role = role.split("_r")[0]
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pwdentry = pwd.getpwnam(user[1])
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home = pwdentry[5]
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if home == "/":
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continue
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prefs = {}
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prefs["role"] = role
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prefs["home"] = home
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prefs["name"] = pwdentry[0]
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prefs["uid"] = pwdentry[2]
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udict[user[1]] = prefs
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except KeyError:
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sys.stderr.write("The user \"%s\" is not present in the passwd file, skipping...\n" % user[1])
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return udict
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def getHomeDirContext(self, seuser, home, role, username, userid):
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ret = "\n\n#\n# Context for user %s\n#\n\n" % seuser
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rc = getstatusoutput("grep -E '^HOME_DIR|%%{USERID}|%%{USERNAME}' %s | sed"
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" -e 's|HOME_DIR|%s|'"
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" -e 's|ROLE|%s|'"
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" -e 's|system_u|%s|'"
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" -e 's|%%{USERID}|%s|'"
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" -e 's|%%{USERNAME}|%s|'"
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% (self.getHomeDirTemplate(), home, role, seuser, userid, username))
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if rc[0] != 0:
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errorExit("sed error (" + str(rc[0]) + "): " + rc[1])
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return ret + rc[1] + "\n"
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def genHomeDirContext(self):
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users = self.getUsers()
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ret=""
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# Fill in HOME and ROLE for users that are defined
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for u in users:
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ret += self.getHomeDirContext (u, users[u]["home"], users[u]["role"], users[u]["name"], users[u]["uid"])
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return ret+"\n"
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def checkExists(self, home):
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if getstatusoutput("grep -E '^%s[^[:alnum:]_-]' %s" % (home, self.getFileContextFile()))[0] == 0:
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return 0
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#this works by grepping the file_contexts for
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# 1. ^/ makes sure this is not a comment
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# 2. prints only the regex in the first column first cut on \t then on space
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rc=getstatusoutput("grep \"^/\" %s | cut -f 1 | cut -f 1 -d \" \" " % self.getFileContextFile() )
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if rc[0] == 0:
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prefix_regex = rc[1].split("\n")
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else:
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sys.stderr.write("%s\n" % rc[1])
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sys.stderr.write("You do not have access to grep/cut/the file contexts\n")
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sys.stderr.flush()
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exists=1
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for regex in prefix_regex:
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#match a trailing (/*)? which is actually a bug in rpc_pipefs
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regex = re.sub(r"\(/\*\)\?$", "", regex)
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#match a trailing .+
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regex = re.sub(r"\.+$", "", regex)
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#match a trailing .*
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regex = re.sub(r"\.\*$", "", regex)
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#strip a (/.*)? which matches anything trailing to a /*$ which matches trailing /'s
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regex = re.sub(r"\(\/\.\*\)\?", "", regex)
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regex = regex + "/*$"
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if re.search(regex, home, 0):
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exists = 0
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break
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if exists == 1:
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return 1
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return 0
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def getHomeDirs(self):
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homedirs = []
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homedirs = homedirs + getDefaultHomeDir()
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starting_uid=getStartingUID()
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if self.usepwd==0:
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return homedirs
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ulist = pwd.getpwall()
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for u in ulist:
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if u[2] >= starting_uid and \
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not u[6] in EXCLUDE_LOGINS and \
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u[5] != "/" and \
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u[5].count("/") > 1:
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homedir = u[5][:u[5].rfind("/")]
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if not homedir in homedirs:
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if self.checkExists(homedir)==0:
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warning("%s is already defined in %s,\n%s will not create a new context." % (homedir, self.getFileContextFile(), sys.argv[0]))
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else:
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homedirs.append(homedir)
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homedirs.sort()
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return homedirs
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def genoutput(self):
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ret= self.heading()
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for h in self.getHomeDirs():
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ret += self.getHomeDirContext ("user_u" , h+'/[^/]+', "user", "[^/]+", "[0-9]+")
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ret += self.getHomeRootContext(h)
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ret += self.genHomeDirContext()
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return ret
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def write(self):
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try:
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fd = open(self.getFileContextDir()+"/file_contexts.homedirs", "w")
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fd.write(self.genoutput())
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fd.close()
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except IOError as error:
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sys.stderr.write("%s: %s\n" % ( sys.argv[0], error ))
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#
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# This script will generate home dir file context
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# based off the homedir_template file, entries in the password file, and
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#
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try:
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usepwd=1
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directory="/etc/selinux"
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setype=None
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gopts, cmds = getopt.getopt(sys.argv[1:], 'nd:t:', ['help',
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'type=',
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'nopasswd',
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'dir='])
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for o,a in gopts:
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if o in ('--type', '-t'):
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setype=a
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if o in ('--nopasswd', '-n'):
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usepwd=0
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if o in ('--dir', '-d'):
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directory=a
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if o == '--help':
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usage()
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if setype is None:
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setype=getSELinuxType(directory)
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if len(cmds) != 0:
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usage()
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selconf=selinuxConfig(directory, setype, usepwd)
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selconf.write()
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except Exception as error:
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errorExit(error)
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